Nichiha Corp.

Takahiro Yamaguchi

Toshio Imai

Mamoru Murase

Provided is a functional building board having an antimicrobial function, which retains anti-algal and antifungal agents for a long period of time in a coat on an external wall material by using several kinds of antimicrobial composite materials, and is provided with stain-proofing function to wash away stains on the external wall material, and in which the design is not largely restricted by the color of the anti-algal or antifungal paint or by the state of the coat and the design is not influenced by the coating step in the final step. The building board according to the present invention has a coat formed on the surface, and is characterized in that antimicrobial composite materials are included on the surface of the coat and a coat layer containing colloidal silica as a main component is formed, said antimicrobial composite materials being characterized in that they control generation of algae and fungi and said building board being a fiber reinforced cement board.

Building board

A method of painting building boards includes the steps of conveying each of a plurality of building boards on a conveyor in turn to a painting position, injecting paint from a plurality of injection nozzles arranged over the painting position when the building board passes the painting position, so that the board is painted with the injected paint, and cleaning each injection nozzle by cleaning means timely during interruption of an injecting operation of each injection nozzle so that the paint adherent to the lower end of each injection nozzle and around each injection nozzle is removed.

Method of painting building boards

In a method of painting a building board being conveyed on a conveyor by means of a spray painting apparatus so that a plurality of colors of gradated or shaded patterns are formed, a plurality of spray guns are connected to a plurality of paint supply systems supplying different colors of paint, respectively. The spray guns are arranged in parallel to a direction in which the building board is conveyed. With the spray guns being reciprocated in a direction crossing the direction in which the building board is conveyed, each of the spray guns is intermittently turned on and off so that the paints of colors different from one another are sprayed from the spray guns onto the surface of the building board. The relation between a speed of the reciprocation of each spray gun and a speed of conveyance of the building board is expressed by L.ltoreq.P.times.N where L is a distance that the building board is conveyed during one reciprocation of the spray guns, P is an average arrangement pitch of the spray guns, and N is the number of the spray guns.

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Ichinomiya, Japan

Takahiro Yamaguchi